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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9ffd0c9b558dd036dbd620c3bd98143cfc694f61b23829fd3b4ebc7a250c3b' 
  AND token = 'KQt44c/hBQYbonTND16snxFNCDaWk3C+hiomzR6zBdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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