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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53bac1a885abe6d41a255c94e9d468f9473b042ddc168c6fc822ca5ce13b97e' 
  AND token = 'kKRQr2Um87jUsP5sr92iDCncRaLMpouV07ZKBaSIihQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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