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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83c045420bf48afc062b2a8cad72060c265086abaa8703430b27ffc446905fa' 
  AND token = 'yscDxG6c/Mj1XziWky6X59y3RLwjCnyrnrXM+4GT1ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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