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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b551fad950a1bc12ece2aac1fbea2c3d5bc3519e8dc82a0c55e26d6098a697d' 
  AND token = 'TJ3PJuDhOfRzTzqmsmRj34sG8Zks1ggJyWBzokHL7fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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