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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2714007e13b53dce2f991ec919e5a04eb94f765ef7f363ed43042f1ae9c704a' 
  AND token = 'TyTgQJMsnoPDW6HT4r8ejZe/p6W47ntXRO3bGo30fQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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