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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8bb3acec6d01138c9b0e06bffa2e31b7ac72dbe20ec3d7421751f17caa37dd8' 
  AND token = 'VSSpjTCWdKB65HmzVgVSxFTuOtBJd6a274/Up5pdv7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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