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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ecd4c64e985b18791be0f044502d16f521e16ab1d3745454c4b54b569d4b385' 
  AND token = 'zKecPTxCKRklsOtv0WVvOCWEvrz0KF0/yKs4vlGREzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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