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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d650ba1db3bd6c4c3e03d872077d00b1170079a3de0d547fc264ae663c1c9e' 
  AND token = 'T65hvCkRl2A70EdCX7qE3Zwi0+GH4I6uIU0Wy08MeW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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