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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fefbfafe7a3ac1f8af00247055cfcb3c33a9860fb462f9dceeed98006d3cfb' 
  AND token = 'q/15+Vm0gxqk3H/dbVTE/JujYM8Nh+slXksTqm87p8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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