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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f46a089f718b907474739f0c000540cab2a3375649de1de97c27fb50667c5a' 
  AND token = '5h2/180N1ZUC7CHjEmbkL2ZsSpPJ/AvaVUG525q/25U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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