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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d12f03fdda37661dfacc4033f3788979094bdd30cf36c322d01a9dcd838ebb' 
  AND token = 'UPhPwT4mMwmdpvU1tAtmovHBSiyIinIHUF4iXHH9pjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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