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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1669558c584998e59f45ef7b73ce81111eab03429fadf2282329a06e8d1b33b8' 
  AND token = 'd8LDoucmhGL1pmDY3y0ixwYsotC3GD9e07sCxLu5mRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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