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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7d94cb3fa4263cbfe9992e4550176624c20150f390dd2ed3b7800b80c9310a' 
  AND token = '5zsBP+HaVaRbGxZ9udiIvk0Zgiydke76gAjJmhH5DfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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