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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f669295c946146b19c22ba6ba5ea452820fd6314a79f9b63e031f89bed9ea5' 
  AND token = 'JtxhW738b+AmzvZulm49c4fNdSEUsMdwZMefy5p1W78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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