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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b6ee4b20e767ff8af7ea39d75883f944168e93d88f36fad31a980ec97dcb5e' 
  AND token = 'tXKbxlyV3C76hhB4IloYosdfwO1VmKM94jNjmnb+0J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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