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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1a4fe2baa30ab200f9a49e8589243ed20eccdff9bf049dae8482bc50aad4e7' 
  AND token = 'If71Stgp1dM/ZxphOggKQEOkT0/DQna/6jj0+7T8l/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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