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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '122e78a69656df31a4a2218121e6beb69060a8eacb3e7bdb9e38e4abd7616683' 
  AND token = 'VfUv6PgbpobX4pCryu2NkIDUcAIwl58pwBofFz3Gyu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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