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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1584a0ea8bae7103a60b5b01bbe3909c570b89b333be17690f544921d06a971a' 
  AND token = 'uq9VwoU8Vzp8DzfHHsAQZRPrS411jpwmwsTU2VkDncg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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