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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7ca6563ca4cc8dfaa06d15f577e2e68978e39fea9188b938f434fdbfb98d5d' 
  AND token = '7VH/iLfK8biD/Fi4Nj0xCT4m6Pejv1mWkkPgA1GuhfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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