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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa63d9fa337baa4a46d5402dd4f2a9bf1105ac6041c18e963ea5cc139c3ad1e0' 
  AND token = 'KUaOovTIC6qj4vBA9f4HadLg6tGzkKj9zhrKOEoFfqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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