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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1e51408122b73ea37ea0bbb2413879bb3b0c963b0db2e54601d4dc805bb078' 
  AND token = 'NBr9HNcn+N/0WuP+Bzr0wHStPo3r96SWgIE8HleFlKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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