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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36cbb5e31a34c771282fd046703a698083a8f8a46ec495114887c815f374f5da' 
  AND token = 't7o0YUo17nzvTvE3wTt+NMslvER2NkJPIajELJoj29w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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