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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7049798322c39cb726f56eece1f9bd4fdf03161c0fd1fc02445e6e536ef920de' 
  AND token = '1uJSQINxZ6i9PeUy4UVu2wdQyG11png/GxpttbRYz2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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