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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835d07111670c5ca4957614e0b1f16a3aae413fbd4c0d18d78af406c69bcb88f' 
  AND token = 'aenVi5akS1d0Tiwp9vUpVfk320Qo9F1zIR1Fq+f6KoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}