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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb294bde1ec6c2c1e7314e45cb64b98bf64d3288d34c7b9f4b617304565ec59' 
  AND token = '6BVl7HC9x+YgiDvd4dW6DNM0265aZYiOUH7GcHxwwQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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