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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071b728eba3e12636016ca452795835f12e3d7cc9d7647a04781b676328b055a' 
  AND token = 'f5fxc9BhjSxWxMpd7u8qhrnrVSrobZh5Rn/eT5b4fjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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