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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f4f8400e11a844610ab4efdc2ef0debd37488ea664de6b44b02b5985af513c' 
  AND token = 'axlUQxzPrUT1mhEXEB2GiiuTRhxXpOuTxbLUJfaUA74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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