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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61dc3e818cd1a9d54772693dcd4f5c5398227851de345e03ef7f99c862d0664b' 
  AND token = 'c+BfZ9/LObryx9c8/aHwjUlkbXgaqZT6yR7QCP7rKa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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