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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796f2aa082208b5225f8f187fc58b95227151cc03b83e3943f467af4c67a0a0e' 
  AND token = 'ziyh6agpvJ0L6b1bEqOFOHUbBrwWTa2qm8zXtIcLKAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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