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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91af71972d8177b13b9de51b82df22f0206a73382a7fcace4dde5d665d8e921b' 
  AND token = 'Qtei1INealIF1pMWGO/IbjS5NKkvrKJv2Q64EPIaSOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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