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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd258e15c1e83fc80bf8bf4c7af6a559ddacc66317c1451b8bc1cce9571e91e0' 
  AND token = 'SH54UcwHJUtXTjX1NsZKG0oWqEvKZQAauDDRcYIoebs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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