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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036833e71da86b2cb954df8675fdbd3de0a2abbcd9208b52adde7e3f6704a277' 
  AND token = 'Tm4TijbF+y7Qj5z5kybPpCuOp7bwd4OkhNdlskTluZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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