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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0e7e5130788b483354b4779ab418a6b8ec3a801c7ef991a59a1005a72a36a3' 
  AND token = '7O5rshEA2GzdgwZQiIF9Y8y5KYXizWYuaI8mB4GK77Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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