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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6cce83e9ad6f489b3a88cf4c498f42b02ae709ece77a1c3bd42184087e090b' 
  AND token = 'XrKDbMGmJh1KIVHke12IlKaGKzyZa+Ld827sZL97fus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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