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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fad6ac19c498430f079780a46014c3fefde5cbc054e9b06e79b3b4c2f13a6e' 
  AND token = 'He/27YD96NJh2wxfN44dDpv7W8eYMYPYqxBow/Ho1EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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