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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ed64736971bd51c81c6509ae7532def73e2cd72978c520e5d1c9f81f3adc01' 
  AND token = 'GM77BC1606F75KxUSIUFwpDcVb/847B0uit4YhUHZ24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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