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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869254917c9ffb2258c1867f0f0461781a118f277f247fa04057d78c509e1b9e' 
  AND token = 'DpR6GQ0LiCzPxE0sWraWOzygYpwlP/vGrl8jJgEgg9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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