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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2344f5b78e68fdf6a33a8b08dec26395a8c30ffbb249c2a9d6b3df5810ad8967' 
  AND token = 'QjhAy3wNMtFNWqBni5VszQ3aH1WL4nQSteP9GrV5Co0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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