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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f55484ec03bdd16a6e4efae8a8638f24951fa1e1cab81a408ea1604254af83' 
  AND token = '3XvyjnIsbO1j+ljlvwmEF7wnHgWd8+nAOSCh+Mmdm1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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