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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93faf03279e63e36f79532ceef048837c64ad7a952536155f8fa266502f50ab0' 
  AND token = 'UmmaZAEQ4w2ortaWEPTkaDkP9cge3g730tUV8Qn1PQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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