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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab70712112478491278bcd13cf30dc9a27b1fd412c08fe0b0d92087cf9c4f4d6' 
  AND token = 'R0c4PsfyYVcIvBIcga9QYcKdgPatgaMtVJxN1xwFjqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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