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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8027b92892502eb071dfc203ff98863c2ce4f3920a8f0fa7fa940277d4a132' 
  AND token = 'mWnOsiHRT280dlHCItsazWj4AfFnd+mwJzsGorfXhMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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