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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52bb685bd4316892d5629a3d88ae9e944b6f91c3997a5afea6122494ec4fdd1a' 
  AND token = 'qOCioLvAmhDnk6uHujJ5EXFoinqzMSQagp8pNO3Ll/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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