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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ba7c851778bda5da3e98d21737c7e61a37c49d0c3a061d21f56043dcce7850' 
  AND token = 'ssbO090FUxE3OGJuN+fZlG+6dNZxRY0FeUI1t/+31cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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