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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90aae1ef3620f514395711839f3d4ea8198047af234fb26bac1401c1aab11012' 
  AND token = 'n77eobY3B3zjJC1gyYhpFOQUBy1X6nwTSTYEqa61B74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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