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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4389297d974029f2ac2b1c42a8fcc4ae6d42bc08b68d3abae7a1c8ccc8e84829' 
  AND token = 'wsldo/3OE80x2yxzPcvL8NP9UZ68Xx/PW5sarjk3X1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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