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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f00363c5837a25c85f1a08dae89917b0d5d8dff978db3e88b15693da106aa2' 
  AND token = '5kssNLTb41SjhCWbaUeb4ie0zwDpvcPqm/mOIsbTNZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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