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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7bb5027266e4d990906d7df6b23b63232322b6d8fff3fa6406c080fb2481ea' 
  AND token = '55SeAyKkYzluSZJD1bvP8OAB4Ab8/XikSXCrraAkazE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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