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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1c31a1b76509c7629c69585d8a196eb118628ac74ebde3a86c4f2bb3def327' 
  AND token = '7n3aRbpz5J+8OlyrkPahuOSkH6ArLF2pO/B7vAxRK5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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