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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209cd8f03817e3ec30bf6afd5ea7c96178c67b60709f24ba49078c322adc3c5a' 
  AND token = 'rMr1pM/kKFM8bw0AW1NMOjQZZlwMqlG1Auphoi+J3IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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