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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8184daf74f87534395186538ca921357a0eec051e373b12fb4e80449c4db3d0c' 
  AND token = 'DftReVyl9nbKKmQhfS2fCQqPYVL1XTNHdtxK5p7FtX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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