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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5cd040545b4204e0b2134d07c5b1ddb35c4dec5b38351122a0c136138cffdc7' 
  AND token = 'YDBAw9/4ynjaT0apZpOCkzNe5qdx5Wy9MMasN8/WVR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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