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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8351f6a7fc3947f808579ad38e36868eea84bfaee5a5534d8ed99cb422299dd' 
  AND token = 'LehkV8a+ESJgLQkUzEyD4I4/viNaDzQ0ztgpi+an/h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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