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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c706b49057e01b949ed7f75a2dae8ebdc4bb0df1ce9eff20dcf9d527fe78da88' 
  AND token = 'tOTbES3PQeI9K7+AGKnp2BRK8F4/8vnjTArDmWe2Scc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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