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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f7177ebbcc901c45c2554e8acf36f4b4b724e12f88538d1e2ec06aeda11760' 
  AND token = 'o5YDWgWYeAsH10KU/0BqPtu0TNqq3S+1W7LmOdVWtIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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