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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df68773f93526f2a5458e0e9e61e32f39e669bea8b406e6e077f1a97160e77d' 
  AND token = 'TylGRBYHXCSZ/Xx+95XckTl99vaZAtpxV7E2p3i9bbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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