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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2824db99eb8ac2c4ad7daf78ede66e78fcbe84202705679c50475a7ff691371' 
  AND token = 'qT0wUmmftWtl2xQKH4Vwv2ktlK8Z/X8r5OBg8T5f9fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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