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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eacf6bdd6887000c4646d3d788f0a9d8d34f47cee92dc000abd11919c0752c9' 
  AND token = 'hX55tlwuQGe0rau5raFuHkZcPsemwbiyF0mU9l+N3CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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