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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9304ebc44f7e1b98907afa5c134a2260ec56cacefdc13b6265d4e32a35e52e' 
  AND token = 'OpBeZdrokaig+Eeyiq9T93VZOZhJaleGpI3SIJA0X0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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